HIGH AVERAGE-POWER THZ RADIATION FROM FEMTOSECOND LASER-IRRADIATED INAS IN A MAGNETIC-FIELD AND ITS ELLIPTIC POLARIZATION CHARACTERISTICS

The THz-radiation power from bulk InAs irradiated with femtosecond opt ical pulses is significantly enhanced and reaches 650 mu W in a 1.7-T magnetic field with 1.5-W excitation power. The THz-radiation power is related almost quadratically both to the magnetic field and excitatio n laser power. We have also found that the power of the THz-radiation from an InAs sample in a magnetic field is over one order of magnitude higher than that from GaAs. Additionally, a dramatic change of ellipt icity is observed, and the spectra of the horizontal and vertical pola rization components are found to differ. (C) 1998 American Institute o f Physics.